backpacking vs cruising

backpacking

noun
  • low-cost, generally urban, travel with minimal luggage and frugal accommodations. 

  • hiking and camping overnight in backcountry with one's gear carried in a backpack. 

cruising

noun
  • Driving around without an exact destination as a social activity 

  • Walking or driving about a locality in search of a casual sex partner, especially among gay males. 

  • Sailing about without an exact destination, usually for pleasure. 

How often have the words backpacking and cruising occurred in a corpus of books? (source: Google Ngram Viewer )